first divide it into 3 groups... 4 for each group...
7 E6 j9 g6 x, w" r* |3 e9 h1 vtvb now,tvbnow,bttvbden use 2 groups to test... if the weight is same... den throw away these 2 groups.. if not... use another 1 group to test with tat 2 groups... throw away the same weight groups...
: U9 G L% H) H( l0 V* P/ \7 ?den... left 4 balls...
# t: g! ~1 T0 g) l4 f& p, _tvb now,tvbnow,bttvbwhen u use tat 3 groups to test... u oredi know it is heavier or not...公仔箱論壇; M q0 _( o: G0 C( O
so when testing these 4 balls... u juz nit 2 find out the heavier or lighter 1...
/ ~$ W& r# z( Htvboxnow.comtake the heavier or lighter 1... throw away tat 2 normal ball...
- v2 V* | w! K, l4 @( xden u juz nit 2 test the last 2 balls...
7 P- {; G3 v n9 x- |9 x! o& f0 Esame for now... take the heavier or lighter 1... |